A method and device for generating synthetic vortex sound field (SVSF) with more mode number includes the following steps: (1) a transducer array composed of N transducer units is constructed, and each transducer unit emits a sound field to generate an initial sound field; (2) at the same time, the position of the transducer unit and the phase of the sound field emitted by each transducer unit are changed, and each change produces a sound field, and thus changings times produces of sound fields, wherein the way to change the position of the transducer unit is to rotate the transducer array as a whole; (3) the initial sound field is superimposed with s of sound fields generated in step (2), to obtain SVSF with more mode number. The method and device for generating vortex sound field (VSF) can be used for underwater communication or acoustic imaging.
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2. The method according to claim 1, wherein rotating the transducer array as a whole the s number times so that the N transducer units have a total of Ns=(s+1)×N different transducer positions, and forms a virtual synthetic transducer array having an equivalent of Ns array elements.
3. The method according to claim 2, wherein array elements of said synthetic transducer array are arranged on one circle or on at least two concentric circles.
5. The method according to claim 3, wherein the array elements on each circle are evenly spaced apart.
6. The method according to claim 1, wherein the N transducer units are arranged on one circle having an axis perpendicular to the circle, and the transducer array is configured to rotate about the axis.
9. The method according to claim 1, further comprising placing the transducer array underwater and carrying out steps (b) to (e).
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January 26, 2021
December 6, 2022
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